ok it's this BUG
https://bugzilla.kernel.org/show_bug.cgi?id=97231#c6

diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index a58fec9..1ba4e30 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -208,7 +208,7 @@ show_fault_oops(struct pt_regs *regs, unsigned long address)
 	if (!oops_may_print())
 		return;
 
-	printk(KERN_ALERT "BUG: unable to handle kernel ");
+	printk(KERN_ALERT "BUG2: unable to handle kernel ");
 	if (address < PAGE_SIZE)
 		printk(KERN_CONT "NULL pointer dereference");
 	else
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index ede025f..bc8229c 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -604,7 +604,7 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code,
 			printk(smep_warning, from_kuid(&init_user_ns, current_uid()));
 	}
 
-	printk(KERN_ALERT "BUG: unable to handle kernel ");
+	printk(KERN_ALERT "BUGGY: unable to handle kernel ");
 	if (address < PAGE_SIZE)
 		printk(KERN_CONT "NULL pointer dereference");
 	else
